The Los Angeles County Museum of Art’s Art + Film Gala is a party so nice, we had to visit it twice. After all, it is the unofficial “Met Ball of the West,” given its heady mix of Hollywood A-listers, fashion elite and art heavyweights. As such, the photographers Mert Alas and Marcus Piggott gave W an exclusive, intimate glimpse into the night’s glamorous shenanigans from a tropically-tuxedoed Alessandro Michele (Gucci is the gala’s presenting sponsor) to Demi Moore’s playful spectacles game. Click through for the most fashionable party photos this side of Pacific.